2011512521 has 4 divisors (see below), whose sum is σ = 2060573844. Its totient is φ = 1962451200.

The previous prime is 2011512509. The next prime is 2011512557. The reversal of 2011512521 is 1252151102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1252151102 = 2 ⋅626075551.

It can be written as a sum of positive squares in 2 ways, for example, as 564775225 + 1446737296 = 23765^2 + 38036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2011512521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011512493 and 2011512502.

It is not an unprimeable number, because it can be changed into a prime (2011512821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24530600 + ... + 24530681.

It is an arithmetic number, because the mean of its divisors is an integer number (515143461).

Almost surely, 2^2011512521 is an apocalyptic number.

It is an amenable number.

2011512521 is a deficient number, since it is larger than the sum of its proper divisors (49061323).

2011512521 is an equidigital number, since it uses as much as digits as its factorization.

2011512521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49061322.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 2011512521 is about 44849.8887512556. Note that the first 3 decimals coincide. The cubic root of 2011512521 is about 1262.3339040519. Note that the first 3 decimals are identical.

Adding to 2011512521 its reverse (1252151102), we get a palindrome (3263663623).

The spelling of 2011512521 in words is "two billion, eleven million, five hundred twelve thousand, five hundred twenty-one".